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Managing Buffering and Download
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In progressive video download, the media infrastructure determines how much video it needs to cache before it can start playing back the video. Depending on the bandwidth required to serve the video and the bandwidth available, the media infrastructure creates a buffer to hold enough video so that it can start playing back the video while it is downloading video to the buffer in the background. When the buffer is 100 percent full, the video begins playing back. Video might pause momentarily as network conditions change and the buffer is refilled. With Silverlight, you can monitor this behavior with the BufferingProgressChanged event and the BufferingProgress property. You can use these controls to provide the current buffering status to users or to run logic to improve your user experience (UX) as a result of buffering conditions. For example, you might have a poor connection, and buffering might never improve to more than 50 percent. You can trap this value and provide the appropriate feedback to your client. To manage buffering, hook an event handler to your MediaElement that defines a function to handle the BufferingProgressChanged event like this:
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<MediaElement x:Name="vid" Source="balls.wmv" Height="200" Width="200" Stretch="Fill" BufferingProgressChanged="doBuff"/> <TextBlock x:Name="txtBuff"></TextBlock>
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This specifies that a function called doBuff will run whenever the buffering progress changes. This event works hand in hand with the BufferingProgress property. The BufferingProgress property contains a value from 0 to 1, where 0 is an empty buffer and 1 is a full buffer. The event fires when the buffer changes by 5 percent (that is, 0.05) or more and when it is full. Following is code that you can use to handle this event firing that provides feedback to your users on the current state of the buffer. First, here s the JavaScript version:
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function doBuff(sender, args) { var theText = sender.findName("txtBuff"); var meVid = sender.findName("vid"); var prog = meVid.BufferingProgress * 100; prog = "Buffering % " + prog; theText.Text = prog; }
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And here s how you would do it if you were using .NET code-behind (with C#):
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private void doBuff(object sender, RoutedEventArgs e) { double prog = vid.BufferingProgress * 100; txtBuff.Text = "Buffering % " + prog; }
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You can override the automatic buffer by setting a specific buffer time. So, if you want to control the video-buffering process so that you ll always have a 10-second buffer of video and thereby reduce your risk of paused video while buffers resynchronize in bad network conditions, you can set the BufferingTime property. You set this property using a time span. To apply a 10-second buffer, for example, you specify the BufferingTime as 0:0:10, as shown in the following example:
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<MediaElement x:Name="vid" Source="balls.wmv" Height="200" Width="200" Stretch="Fill" BufferingProgressChanged="doBuff" BufferingTime="0:0:10"/> <TextBlock x:Name="txtBuff"></TextBlock> <TextBlock x:Name="txtDown"></TextBlock>
When progressive download isn t available or supported, the entire video file needs to be downloaded before it can be played back. In this case, you can use the DownloadProgressChanged event and DownloadProgress property to provide the status of the download. You use these in the same manner as the buffering functions. Following is XAML that defines a DownloadProgressChanged event:
<MediaElement x:Name="vid" Source="balls.wmv" Height="200" Width="200" Stretch="Fill" BufferingProgressChanged="doBuff" BufferingTime="0:0:10" DownloadProgressChanged="doDown"/> <TextBlock x:Name="txtBuff"></TextBlock> <TextBlock x:Name="txtDown"></TextBlock>
And following is the code for the doDown function that defines the event handler again, first take a look at the JavaScript version:
function doDown(sender, args) { var theText = sender.findName("txtDown"); var meVid = sender.findName("vid"); var prog = meVid.DownloadProgress * 100; prog = "Downloading % " + prog; txtDown.Text = prog; }
And here is the .NET version:
private void doDown(object sender, RoutedEventArgs e) { double prog = vid.DownloadProgress * 100; txtDown.Text = "Downloading % " + prog; }
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